Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d06fc41672f11fa…

MALICIOUS

PDF

139.8 KB Created: 2021-03-03 12:15:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 856225c4bb63f27b03c041222b5f2f31 SHA-1: 743d23a33a7a2ea71ab900ade9123dab17c0a1b0 SHA-256: 8d06fc41672f11fa053542b83d8fd5ae587b77764e8aaf7953886c92eaec1dfc
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://druttle.ru/123?utm_term=internal+combustion+engine+diagram PDF link annotation
    • http://andyhong.blog/264352310910on09.pdfIn PDF document text
    • http://rozewevojalel.sportsontheweb.net/xijedorifakejip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454286/normal_6015d3f8f3dc5.pdfIn PDF document text
    • https://cdn.sqhk.co/surixirulol/N67aLjh/16936433471.pdfIn PDF document text
    • http://artdebug.site/bgg_terraforming_mars_venus_nextysq3b.pdfIn PDF document text
    • https://cdn.sqhk.co/rowemarul/hfJrifm/tatesabususogijok.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479675/normal_5fcce12cf16b1.pdfIn PDF document text
    • http://doucheapp.xyz/constructive_dismissal_template_uk041vd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366354/normal_5fe2e88ed78a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461516/normal_600b33d3a2781.pdfIn PDF document text
    • http://sijubuwejipamun.mywebcommunity.org/travel_trac_comp_fluid_trainer_reviews.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458413/normal_5fd95b62e2d2e.pdfIn PDF document text
    • http://jefevivavifax.scienceontheweb.net/lakipejibuput.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494681/normal_6038b6386d1a4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jizubisetebof/candy_crush_soda_mod_apk_old_version.pdfIn PDF document text
    • http://vakogez.myartsonline.com/89364127393.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001c297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C297 5336 bytes
SHA-256: 2195cfbfe2a802582acaf9921a5f6c8c56e31a090a060b22d435aa185afd6ae4
font_01_sfnt_off0001d49a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D49A 12200 bytes
SHA-256: 7dda68c3a1ff06c0211436f5712eb23ffe60b946eecaeaa1cd246d65eb05c10d
font_02_sfnt_off0001fd39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FD39 16060 bytes
SHA-256: d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7
font_03_sfnt_off000211cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x211CF 6084 bytes
SHA-256: fabec606e516cf69f6dec6919936ba93b659fa13295e205095b57fc70665da06

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